Piston.



K. MATHEUS.

' PISTON.

APPLICATION FILED JUNE 2,1908.

Patented Oct. 27, 1908.

so wnsnuvcrmv, n. c.

KARL MATHEUS, OF CHICAGO, ILLINOIS.

PISTON.-

Specification of Letters Patent.

Patented Oct. 27, 1908.

Application filed June 2, 1908. Serial No. 436,274.

To all whom it may concern:

Be it known that I, KARL MATHEUs, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinols, have invented certain new and useful Improvements in Pistons, of which the following is a specification.

This invention relates to that class of pistons which employs a pair of connected heads surrounded by a bull ring; and the object of the invention is to so construct and unite the heads that a firm and steam tight joint will be afforded, providing a grooved channel around the periphery of the' heads for the reception of the bull ring. In this class of pistons it is the practice to disengage the members composing the piston when it is desirable to remove the bull ring for the purpose of renewing packing or for any other purpose; and the present invention is intended to provide suitable means for easily and quickly engaging or disengaging the members as occasion may require.

The invention relates particularly to the interlocking lugs which are intended to be formed in such a manner as to rigidly secure the parts together, and are of a shape and construction to enable them to be readily formed in a lathe, which greatly facilitates the construction of the parts.

A further object of the invention is to so arrange and construct the locking bolt which holds the interlocking lugs in engaged position that a steam tight joint will be afforded, which is essential in securing perfect operation of the piston.

The invention also relates to the means provided for disengaging the interlocking lugs as occasion requires, in order to permit the removal of the bull ring.

The invention further relates to the construction and arrangement of the bull itself, whereby an intermittent rotation of the ring is secured, which tends to secure uniformity in the wearing action upon the cylinder wall and to preserve the life of the packing to a very marked degree.

Further objects of the invention will appear from a detailed description of the invention, which consists in the features of construction and combination of parts hereinafter described and claimed.

In the drawings, Figure l is a face view of one of the piston heads, showing the locking bolt and the disengaging set screw; Fig. 2 an edge elevation of the bull ring; Fig. 3 an edge elevation of the two heads in locked position, showing the bull ring in section; Fig. 4 an edge elevation of one of the heads; Fig. 5 a similar view of the other head; Fig. 6 an inner plan view of the head of Fig. 4; and Fig. 7 a similar view of the head of Fig. 5.

The piston comprises two heads 8 and 9, respectively, of disk shape and of a size to receive and hold the bull ring. Each of the heads is provided, around its inner periphery, with. a groove 10 which, when the parts are assembled, affords a channel for the reception of the bull ring 11 which is provided, in its center, with an inner annular tongue 12 which enters the channel afforded by the grooved heads. The side edges 13 of the bull ring overlie the edges of the heads and lie flush with the side faces thereof; and the bull ring is provided, in its outer face, with a plurality of packing grooves or channels 14 adapted to receive the usual packing. In order to afford a certain amount of rotation to the packing ring, it is fitted loosely within its channel and is provided, on one of its edges, with teeth 15 having beveled faces 16 terminating in abrupt shoulders 17, all the teeth extending in the same direction around the periphery of the bull ring.

The disk shaped head 8 is provided, in its center, with a hub 18, the end of which is adapted to register with a flanged opening 19 in the companion head, which hub is provided with a shoulder against which the flange on the companion head is adapted to abut when the parts are assembled. v Radiating from the base of the hub 18 are a plurality of webs 21 which, in the present construction, are six in number, as best shown in Fig. 6. The webs merge into sup porting lugs 22, each of which has outwardly extending therefrom, an interlocking lug 23. The interlocking lugs are connected with the supporting lugs at one end only, and all of the interlocking lugs extend in the same direction and are undercut to afford a beveled engaging face 24 on the side of the interlocking lug adjacent the inner wall of the disk. One of the lugs thus formed has projecting therefrom a threaded locking pin 25, as shown to the left of Fig. 6.

The disk shaped head 9 is provided with a plurality of similarly formed locking lugs 26 carried by su porting lugs 27 which are reinforced by we s 28, which extend radially from the inner flange surrounding the hole 19. Two of the lugs so formed, on opposite sides of the head, have formed therewith protuberant members 29 and 30,"as shown in ig. 7. The protuberant member 29 is hollowed out from the opposite or outer face of the head 9 to provide a recess 31, and the protuberant member 30 is similarly hollowed out to provide a recess 32, as shown in Fig. 1. Through the wall of the recess 31 adjacent the interlocking lug 26 formed therewith, is entered a set screw 33 whose function is to unlock the members to permit their disengagement. In like manner the recess 32 is provided, in the wall adjacent the interlocking lug 26, with a hole 34 which is adapted to receive the threaded pin 25 when the parts are assembled. The projecting end of the pin 25 receives a nut 35 which preferably bears against a soft metal washer 36, thereby affording a steam tight joint, which is highly important in the present construction. The hub 18 is provided with a bore 37 adapted to receive a piston rod which is secured to the piston in any suitable manner.

In assembling the parts, the tongue of the bull ring is interposed between the two heads, which are registered to bring the threaded pin 25 into alinement with the hole 34, after which a slight turning of the two members with respect to one another will cause the beveled inner faces of the undercut locking lugs to engage one another, each of the locking lugs, when the parts are assembled, overlying the outer end of the supporting lug which carries the cooperating interlocking lug. When the parts are thus assembled the end of the threaded pin will be projected into the recess 32 and in position to receive the washer and nut, which can easily be manipulated from the outside of the head 9. At the same time the inner end of the set screw 25 will be brought into position to abut against the side of one of the supporting lu s, which, when the parts are assembled, wiIl lie in close proximity to, if not in actual contact with, the cooperating supporting lug of the other head. By turning the set screw within the recess 31, the end of the screw will be rojected inwardly, forcing apart the closey adjacent supporting lugs and serving to break the lock. By forming the locking lugs in the manner indicated to provide an undercut clear across the outer edge of the supporting lug, the lu s can be turned in a lathe, which greatly facilitates the making of the piston head as compared with a construction which requires a milling out of these surfaces.

The construction is one which obviates the possibility of the parts becomin rusted or jammed together, and enables them to be positively and quickly released without difficulty. The construction of the bull ring is such that the pressure of the steam, acting against the beveled faces of the teeth, causes eoae 1c the ring as be revolved slightly each admission of steam, so that the packing will be evenly and smoothly worn and maintained in perfect condition for a much longer period of time than is the case with packing which is fixedly held in the same position with respect to the periphery of the piston.

What I- regard as new and desire to secure by Letters Patent is:

1. In a piston, a pair of heads, each provided with interlocking lugs undercut peripherally completely across their interlocking faces, and adapted to be revolubly moved to engage one another, substantially as de scribed. I

2. In a piston, a pair of heads, each pro vided withinterlocking lugs undercut peripherally completely across their interlocking faces and beveled, and adapted to be revolubly moved to engage one another, substantially as described.

3. In a piston, a pair of heads, each provided with interlocking lugs undercut completely across their interlocking faces, and adapted to be revolubly moved to engage one another, one of the heads being provided with a protuberant portion recessed from the outer face of the head, and the other head being provided with a threaded pin adapted to be entered through the wall of said recess, and a nut for engaging the pro jected end of the pin thus entered, substantially as described.

4. In a piston, a pair of heads, each provided with interlocking lugs undercut com pletely across their interlocking faces and beveled, and adapted to be revolubly moved to engage one another, one of the heads being provided with a protuberant portion recessed from the outer face of the head, and the other head being provided with a threaded pin adapted to be entered through the wall of said recess, and a nut for engaging the projected end of the pin thus entered, substantially as described.

5. In a piston, a pair of heads, each provided. with interlocking lugs undercut completely across their interlocking faces, and adapted to be revolubly moved to engage one another, one of the heads being provided with a protuberant portion recessed from the outer face of the head, and the other head being provided with a threaded pin adapted to be entered through the wall of said recess, a nut forengaging the projected end of the pin thus entered, and one of the heads being provided with a protuberant portion recessed from the outside and having a set screw entered therethrough and adapted to bear against a portion of the other head to exert an unlocking pressure, substantially as described.

6. In a piston, a pair of heads, each provided With interlocking lugs undercut completely across their interlocking faces andbeveled, and adapted to be revolubly moved to engage one another, one of the heads being provided with a protuberant portion recessed from the outer face of the head, a nut for engaging the projected end of the pin thus entered, and one of the heads being provided with a protuberant portion recessed from the outside and having a set screw entered therethrough and adapted to bear against a portion of the other head to exert an interlocking pressure, substantially as described.

7. In a piston, a pair of heads, each provided with interlocking lugs undercut completely across their interlocking faces, and adapted to be revolubly moved to engage one another, and a bull ring rotatably held in position between the heads and provided, on its edge, with a plurality of beveled teeth adapted to receive a rotative impetus from the steam admitted against the piston, substantially as described.

8. In a piston, a pair of heads, each provided with interlocking lugs undercut completely across their interlocking faces and beveled, and adapted to be revolubly moved to enga e one another, and a bull ring rotatably held in position between the heads and provided, on its edge, with a plurality of beveled teeth adapted to receive a rotative impetus from the steam admitted against the piston, substantially as described.

9. In a piston, a pair of heads, each provided with interlocking lugs undercut completely across their interlocking faces, and adapted to be revolubly moved to engage one another, one of the heads being provided with a protuberant portion recessed from the outer face of the head, and the other head being provided with a threaded in adapted to be entered through the wall of said recess, a nut for engaging the rojected end of the pin thus entered, and a ull ring rotatably held in position between the heads and provided, on its edge, with a plurality of beveled teeth adapted to receive a rotative impetus from the steam admitted against the piston, substantially as described.

10. In a piston, a pair of heads, each provided with interlocking lugs undercut completely across their interlocking faces and beveled, and adapted to be revolubly moved to engage one another, one of the heads being provided with a protuberant portion recessed from the outer face of the head, and the other head being provided with a threaded pin adapted to be entered through the wall of said recess, a nut for engaging the projected end of the pin thus entered, and a bull ring rotatably held in position between the heads and provided, on its edge, with a plurality of beveled teeth adapted to receive a rotative impetus from the steam admitted against the piston, substantially as described.

11. In combination with the body of a piston, a bull ring mounted to revolve around the periphery of the body and provided, on its edge, with a plurality of beveled teeth out completely through the edge, and adapted to receive a rotative impetus from the steam ad mitted against the piston, substantially as described.

12. In a piston, a pair of heads, each provided with interlocking lugs uhdercut peripherally on their interlocking faces, and adapted to be revolubly moved to engage one another, substantially as described.

13. In a piston, a pair of heads, each provided with interlocking lugs undercut peri herally on their interlocking faces and beve ed, and adapted to be revolubly moved to engage one another, substantially as described.

14. In a piston, a pair of heads, each provided with interlocking lugs undercut peripherally on their interlocking faces, and adapt ed to be revolubly moved to engage one another, one of the heads being provided with a protuberant portion recessed from the outer face of the head, and the otherhead being pro vided with a threaded pin adapted to be entered through the Wall of said recess, and a nut for engaging the projected end of the pin thus entered, substantially as described.

15. In a piston, a pair of heads, each provided with interlocking lugs adapted to be revolubly moved to engage one another, one of the heads being provided with a protuberant portion recessed from the outer face of the head, and the other head being provided with a threaded pin adapted to be entered. through the wall of said recess, and a nut for engaging the projecting end of the pin thus entered, substantially as described.

KARL MATHEUS.

Witnesses:

W'ALKER BANNING, PrERsoN W. BANNING. 

